So the choice of combination would be Doublade and Quetzal to act as a support, multi-hit and Tailwind set up, and the second would Rose/Gustav/Posei for extra power and the Perish Song last resort. I think go with the first combination since we need strong defences to survive such strong foes right now and to also hit as much targets we can.
I kinda have one last idea. Heart and Nathan is the most stealth members of the team. While everyone distract Genesect and his drones, one of us can try to sneak behind them and grab the relic and we can get out of there. Along in the path we can target the ceilings of Genesect chamber, making fall in Genesect and his hive with our most powerfull Range moves. I dont know if this will kill them, but since it is techinally a Rock-type attack, it will at least cause tons of damage against them. Or we can use Rock Smash to weak the ceiling also and make fall. More or less like we done against Seikamater.
Heart could use the Baashaaun boots of Shiva to increase his stealth roll and increase our chances.
There is another thing we could do. Or rather, Heart could. This room is filled with Earthpower according to what I understand from Iron. Since Heart now has the greatest connection to Earthpower from all members of the group, I could, i dont know, try to connect with Genesect and at least try to calm him? More or less like a conection via link like Terra and Deoxys did back there, only this time did in purpose. I could even use Moltres Egg as a channel between them since Moltres by defaut is one of the Three Legendary Bird. If not calm him, it will at least give everyone time to get the relic. Another thing to back that is Heart be bless by one of Jirachi wish tags, so he has a chance. Not to mentioned we could also use Shiva dagger to add another connection link. And if Genesect rage is a some type of Curse, Heart Earthpower can break. Cosh, Gendry, could also help with that since they have those Gauntlets capable of casting spells, so in a way, those Gauntlets can connect to Earthpower. And Heart have connection with that.
Its a long shot, but if there is a possibility we can at least try.
It is possible @Iron?
I kinda have one last idea. Heart and Nathan is the most stealth members of the team. While everyone distract Genesect and his drones, one of us can try to sneak behind them and grab the relic and we can get out of there. Along in the path we can target the ceilings of Genesect chamber, making fall in Genesect and his hive with our most powerfull Range moves. I dont know if this will kill them, but since it is techinally a Rock-type attack, it will at least cause tons of damage against them. Or we can use Rock Smash to weak the ceiling also and make fall. More or less like we done against Seikamater.
Heart could use the Baashaaun boots of Shiva to increase his stealth roll and increase our chances.
There is another thing we could do. Or rather, Heart could. This room is filled with Earthpower according to what I understand from Iron. Since Heart now has the greatest connection to Earthpower from all members of the group, I could, i dont know, try to connect with Genesect and at least try to calm him? More or less like a conection via link like Terra and Deoxys did back there, only this time did in purpose. I could even use Moltres Egg as a channel between them since Moltres by defaut is one of the Three Legendary Bird. If not calm him, it will at least give everyone time to get the relic. Another thing to back that is Heart be bless by one of Jirachi wish tags, so he has a chance. Not to mentioned we could also use Shiva dagger to add another connection link. And if Genesect rage is a some type of Curse, Heart Earthpower can break. Cosh, Gendry, could also help with that since they have those Gauntlets capable of casting spells, so in a way, those Gauntlets can connect to Earthpower. And Heart have connection with that.
Its a long shot, but if there is a possibility we can at least try.
It is possible @Iron?
Kogeki currently ability to active in battles: Anticipation.


Spoiler